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clear
//
//
//
//Variable declaration
Y=1*10**-3 //distance between slits(m)
D=1 //distance between slit and screen(m)
d=1*10**-3 //point distance(m)
lamda=5893*10**-10 //wavelength(angston)
//Calculation
delta1=Y*d/D //path difference(m)
Pd=2*%pi*delta1/lamda //phase difference(radian)
r=(cos(Pd/2))**2 //ratio of intensity
delta2=lamda/4 //path difference(m)
W=delta2*D/d //distance of point on screen from centre(m)
//Result
printf("\n ratio of intensity is %0.4f ",r)
printf("\n distance of point on screen from centre is %0.3f *10**-4 m",W*10**4)
printf("\n answers in the book varies due to rounding off errors")
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